MARTIN UNCLES IN WWII

I had three uncles that served in WWII.My Dad could not serve because of health reasons.I have always wondered where they served and what MOS they were in.My uncles were Robert Wayne Martin, Roy Edward Martin, and Lester May Martin - all from Whitewright, Texas (which is in Grayson County).If anybody out there served with one of my uncles I would like to hear from you.I was just a baby when WWII was going on and don't know about their service.In fact, I have one of those little post cards that Uncle Roy sent my Mom in which he asked about "the new baby".